Created by Phil Zimmermann in 1991, PGP is an acronym for Pretty Good Privacy. PGP is an encryption program that provides privacy for data communications. PGP is used for signing, encrypting and decrypting text, email, files, folders and disk partitions to increase the security of sending/receiving email.
PGP encryption uses a combination of hashing, data compression, symmetric-key cryptography and public-key cryptography. Each public key is bound to a username and/or email address.
To use PGP you will need software. There are many variations of software available depending on the mail client you use. For most email correspondence I use the Chrome (also available for Firefox) extension Mailvelope. If you wish to send/receive PGP encrypted email with me, add my public key to your keyring.